I fell victim to a self-inflicted issue once. Though I wasn't the self who did the inflicting, just the victim

.
I had to borrow a 4x4 pickup from a co-worker for a couple of days as mine was in the shop for some moderate-high regular scheduled maintenance. At one point in my day's work, I needed to use 4x4 to negotiate a steep and muddy grade to a logging landing. This was a late 1990's Dodge 3/4 ton. Not known for their strong 4x4 performance...the slip diffs gutted their abilities significantly anyway, so when I engaged the shifter to 4 by and started up the slope, I was not totally surprised when I immediately slid sideways and off the shoulder on the rear right corner.
After a little messing about though, it became obvious that there was no drive from the front wheels at all. But with some further messing about, I got the rig back on the road, RWD only

.
Later I did some asking (read "interrogation"), and it turned out that the usual operator of this truck had tried to shift into 4x4 from normal 2x4 at far too high a speed (this was a rig with automatic front wheel drive engagement, known as "shift on the fly" in some quarters), breaking "something". Too embarrassed to take it to our mechanics' shop. Been driving it that way for months.
No accounting for foolishness, sometimes.
I did not return it to him, as I'd told him he should now expect

...just traded it in to the shop when I picked up my own truck. Told them the general story, got the expected rolling eyes, but that rig got fixed right, and the usual driver got taught a lesson from both me and the mechanics.